Pile-cutting mechanism for looms



Jan. 18, 1927.

J. TOON FILE CUTTING MECHANISM FOR LOOMS Filed August 21. 1925 ATTOR EY Patented Jan. 18, 1927.

UNITED STATES 1,614,504 PATENT QFFICB] JOHN T0031, OF FREEHOLD, NEW JERSEY.

FILE-CUTTING MECHANISM FOR LOOMS.

Application filed August 21. 1925.

This invention relates to an improved mechanism for cuttlng the plle 1n fabric woven on looms and particularly in that class of looms in which the pile or floats are formed over pile wires.

The present device comprises a knife which is drawn across the woven material being depressed when drawn in one direction so as to out the pile floats and being elevated when returned to its initial position. The knife is preferably drawn to cut the pile when the pile wire is withdrawn and is adapted to co-operate with the wire to do its cutting.

The knife replaces the blade commonly used on the end of a pile wire so that only one knife is employed with the numerous pile wires and the repair and maintenance of the cutting mechanism is much cheaper and a more simple matter.

The invention is illustrated in the accompanying drawings in which Figure 1 is a view of my device and showing enough of the loom to indicate, to one skilled in the art, the location and operation of the device. Figure 2 is a view similar to Figure 1 with the knife lowered and in position to be operative on the goods. Figure 3 is a section on line 33 in Figure 1. Figure 4 is a detail section showing the knife in contact with a pile wire and Figure 5 is a top view, enlarged, of the end of a pile wire adapted to co-operate with the knife.

The device is located on the loom at the place where the pile wires are withdrawn and comprises a knife which is lowered into contact with the fabric to cut the pile floats when moved in one direction and raised out of contact with the fabric when moved in the other direction. V

In the drawing I show a circular knife 10 which is moved back and forth by a rod 11 operated by the lever 12 on the loom, which lever is actuated the same as the pile wire withdrawing mechanism and is synchronized therewith when the knife is used in conjunction with the pile wires. The wheel slides in a support which is illustrated as including a pair of guides 13 and 14 mounted on standards 15 and 16 and held in place by being in sliding engagement with the breast beam 17 of the loom.

When the knife is thrust across the fabric it is lowered. The mechanism for doing this is shown as constituting a cam bar 18 slidable in the clips 19 and having the cam surfaces Serial No. 51,577.

20. On the end of the cam bar 18 is a trigger 21 pivoted intermediate its length as at 22 to a fixed support, asthe breast beam, and pivoted at one end to the cam bar 18. On the rod 11 is a nose 23 which engages the trigger and this slides the cam bar 18 and the support for the knife 10 is depressed as in Figure 2 and the knife engages and cuts the pile. When a circular knife is used it is provided with a pinion 24 and the guide'bar 14 has a rack 25 which is in mesh with the pinion. In this way the knife is positively rotated as itmoves back and forth.

To raise the knife on its return, the hook 26 which engages the trigger at the end of the forward stroke of the rod 11, pulls on the trigger as the return stroke begins and the cam surfaces 20 on the cam bar 18 raise the knife and its associated parts out of contact with the material. The nose 23 is inclined on one face and is usually slightly resilient so that it can ride over the trigger 21 on the return stroke.

When the device is used in conjunction with the pile wire, which is the usual form of use, the motion of the knife during its cutting stroke is timed with the withdrawal time and speed of a pile wire. The pile wire is shown at 27 and is of the usual form eX- c'ept that it is provided with an edge to cooperate with the knife 10 to perform a shear out. This is accomplished in most cases by forming a slit 28 in the pile wire near its free end and the knife, when it descends on its cutting stroke, fits into the slit 28 and the wire and knife form a shear which cuts the pile on the fabric as the knife is withdrawn.

This mechanism employs but one knife instead of forming a knife blade on every wire as is now done and the sharpening and other maintenance of the knife is therefor limited to the one knife. The cutting of the pile floats is shown in Figure 4, the severed ones being shown at 29 after they have been 1,61&,504

on the rod and pinion being in mesh With the rack, a pair of standards to support the frame, a cam bar with cam surfaces to support the standards, a trigger for moving the cam bar, and means on the rod for engaging 15 the trigger whereby the cam bar raises and lowers the frame.

In testimony whereof I athx my signature.

JOHN TOON. 

